EasyPororoOCR Integration

[junhoyeo]

Closes https://github.com/junhoyeo/BetterOCR/issues/2

• [x] Make basic text detection using EasyOCR, Pororo (EasyPororoOCR), and Tesseract work
• [x] Box detection
• [x] Refactor structure
• [x] Make it optional (i.e. Activate only if lang is en or ko)
  • TBD: Also support overriding activated engines though options
  • [x] Dependencies for EasyPororoOCR should also be optional via Poetry groups
• [x] Cite original authors
• TBD: Use pre-processing logic on other engines too? + Evaluation

[black7375]

Thanks. looks good.